Our expert says:
As Liza says, it's a small ritual to help her feel more secure, and probably related to some child fear, fear of the dark perhaps or of beasties under the bed. Tell her if she'd like to discuss it with you, you'd be happy to see if there are other ways to help ; but that it's also OK if she doesn't care to talk about it just now. With not much attention paid to it, it's likely to fade out before long.
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